Sewage Treatment Plant - Sewage Treatment For Wastewater Treatment Plant

Jan. 18, 2011 - PRLog -- There are many methods and processes to treat Wastewater. The most common approach uses primary treatment (screening and clarification) to remove solids; aerobic, suspended growth,activated sludge secondary treatment to reduce organic pollutants; and chlorine disinfection to reduce pathogens.

Ion exchange processes are used  for  the desalina- tion of water with a  low  salt  content. Plants con- sist of a series of columns for  anionic and cationic exchange. When  water  passes  through  the  columns,  the  ions  in the  salt  contained  in  the  water are exchanged with  the  hydroxyls and  with  the hydrogen  ions. When  the  exchange resins have been used they are regenerated using alkaline and acid solutions.

This energy baseline study focus on Aerobic Activated Sludge (AAS), which is by far the most frequently used Wastewater Treatment Plant process consisting of primary treatment, secondary treatment, optional tertiary treatment, disinfection, and sludge processing.

Primary Treatment  

Primary treatment involves screening, grinding and sedimentation/clarification, to remove the floating and settleable solids found in raw wastewater.  When raw wastewater enters the treatment plant it is typically coarse screened to remove large objects, ground to reduce the size of the remaining solids, and then flows to primary sedimentation tanks.

Secondary Treatment

Conventional secondary treatment is accomplished by a biological process called aerobic, suspended growth, activated sludge treatment. Activated sludge secondary treatment typically accounts for 30 to 60% of total plant energy consumption.  Effluent from primary treatment is treated in large reactors or basins.  In these reactors, an aerobic bacterial culture (the activated sludge) is maintained, suspended in the liquid contents. Hydraulic detention time in the secondary reactors ranges from 6 to 8 hours. The secondary process removes organic material that is either colloidal in size or dissolved.  

Tertiary Treatment

Tertiary treatment (also known as “advanced wastewater treatment) is becoming more common as discharge permits increasingly call for the removal of specific contaminants not normally removed during conventional secondary treatment.  Removal of nutrients (particularly nitrogen) prior to discharge requires additional treatment.  Nutrients encourage algal growth in the receiving waters, reducing dissolved oxygen and causing fish kills and odor.

http://www.shubhamindia.com/sewage_treatment_plant.htm
http://sewagetreatmentplant.in/sewage_treatment_plant.htm

# # #

Waters that are used for drinking, manufacturing, farming, and other purposes by residences (toilets, baths, showers, kitchens, sinks), institutions, hospitals, commercial and industrial establishments are degraded in quality as a result of the introduction of contaminating constituents. Organic wastes, suspended solids, bacteria, nitrates, and phosphates are pollutants that commonly must be removed.